2085 - undo/redo now working for simple typing

Not yet useable, because we never ever stop coalescing operations. That
will happen when we introduce a second type of operation.

1 files changed, 5 insertions, 2 deletions

diff --git a/065duplex_list.mu b/065duplex_list.mu
index 3310400d..65cb9592 100644
--- a/065duplex_list.mu
+++ b/065duplex_list.mu
@@ -411,8 +411,11 @@ recipe insert-duplex-range [
   next:address:duplex-list <- next-duplex in
   dest:address:address:duplex-list <- get-address *end, next:offset
   *dest <- copy next
-  dest <- get-address *next, prev:offset
-  *dest <- copy end
+  {
+    break-unless next
+    dest <- get-address *next, prev:offset
+    *dest <- copy end
+  }
   dest <- get-address *in, next:offset
   *dest <- copy start
   dest <- get-address *start, prev:offset